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| 1 | Vibration Control of a Composite Beam Using Self-sensing Semi-active Approach显示文摘Structural vibration control was an active research area for the past twenty years because of their potential applications in aerospace structures,civil structures,naval structures,etc.Semi-active vibration control methods based on piezoelectric actuators and synchronized switch damping on inductance(SSDI) techniques attract the attention of many researchers recently due to their advantages over passive and active methods.In the SSDI method,a switch shunt circuit is connected to the piezoelectric patch to shift the phase and amplify the magnitude of the voltage on the piezoelectric patch.The most important issue in SSDI method is to control the switching actions synchronously with the maximum vibration displacement or maximum strain.Hence,usually a displacement sensor is used to measure the vibration displacement or a collocated piezoelectric sensor is needed to measure the strain of the structure near the piezoelectric actuator.A self-sensing SSDI approach is proposed and applied to the vibration control of a composite beam,which avoids using a separate sensor.In the self-sensing technique,the same piezoelectric element functions as both a sensor and an actuator so that the total number of required piezoelectric elements can be reduced.One problem in the self-sensing actuator,which is the same as that in the traditional collocated piezoelectric sensors,is the noise generated in the sensor signal by the impact of voltage inversion,which may cause extra switching actions and deteriorate control performance.In order to prevent the shunt circuit from over-frequent on-and-off actions,a simple switch control algorithm is proposed.The results of control experiments show that the self-sensing SSDI approach combined with the improved switch control algorithm can effectively suppress over-frequent switching actions and gives good control performance by reducing the vibration amplitude by 45%,about 50% improvement from the traditional SSDI with a separate piezoelectric element and a classical switch. | JI Hongli QIU Jinhao ZHU Kongjun | 2010 | Chinese Journal of Mechanical Engineering2010，23，5： | 5 |
| 2 | High discharged energy density of polymer nanocomposites induced by Nd-doped BaTiO_(3)nanoparticles显示文摘A flexible polymer nanocomposite has been developed via introducing Nd-doped BaTiO_(3)nanoparticles into the poly(vinylidene fluoride).This nanocomposite delivers a discharged energy density up to 12.5 J/cm^(3)under an electric field of 420 kV/mmwith only a small loading of 1 vol.%Nd-BaTiO_(3).High discharged energy density,mechanical flexibility,light weight,ease fabrication and low cost makes it attractive for advanced microelectronics and electrical power systems.Our results demonstrate that ceramics with giant dielectric permittivity as viable fillers for polymer nanocomposite dielectrics with higher energy density. | Jing Wang Juntao Hu Lu Yang Kongjun Zhu Bao-Wen Li Qiaomei Sun Yanxin Li Jinhao Qiu | 2018 | Journal of Materiomics2018，4，1： | 4 |
| 3 | Experimental study and electromechanical model analysis of the nonlinear deformation behavior of IPMC actuators显示文摘This paper develops analytical electromechanical formulas to predict the mechanical deformation of ionic polymer–metal composite(IPMC) cantilever actuators under DC excitation voltages. In this research, IPMC samples with Pt and Ag electrodes were manufactured, and the large nonlinear deformation and the effect of curvature on surface electrode resistance of the IPMC samples were investigated experimentally and theoretically. A distributed electrical model was modified for calculating the distribution of voltage along the bending actuator. Then an irreversible thermodynamic model that could predict the curvature of a unit part of an IPMC actuator is combined with the electrical model so that an analytical electromechanical model is developed. The electromechanical model is then validated against the experimental results obtained from Pt-and Ag-IPMC actuators under various excitation voltages. The good agreement between the electromechanical model and the actuators shows that the analytical electromechanical model can accurately describe the large nonlinear quasi-static deflection behavior of IPMC actuators. | Hongguang Liu Ke Xiong Kan Bian Kongjun Zhu | 2017 | Acta Mechanica Sinica2017，33，2： | 3 |
| 4 | A piezoelectric tracked vehicle with potential application to planetary exploration显示文摘A piezoelectric driving method for rover vehicles is proposed in this paper. Employing this method, a tracked vehicle driven by friction forces from a frame mounted with piezoelectric elements was developed. The vehicle is designed with no driver sprocket, no idler-wheel and no supporting bogie wheels, and the vehicle thus requires no lubrication and has potential application in planetary exploration. The frame consists of a pair of piezoelectric transducers. Each transducer comprises four annular parts jointed by beams adhered with piezoelectric ceramics. The tracks are set to the outer surface of the annular parts by means of track tension. Traveling rotating waves are generated by piezoelectric transducers in the annular parts, which generate microscopic elliptical motions at the interface of the tracks. The microscopic elliptical motions from the piezoelectric transducers drive the track vehicle to move. Finite elements analysis was carried out to verify the operation principle using commercial software ANSYS. Piezoelectric transducers were fabricated, assembled and tested to validate the concepts of the proposed rover vehicle and confirm the simulation results. A prototype vehicle with mass of 0.57 kg moves at a speed of 4.3 mm/s at a driving voltage of 250 V and operating frequency of 65.53 kHz. | JIN JiaMei QIAN Fu YANG Ying ZHANG JianHui ZHU KongJun | 2012 | Chinese Science Bulletin2012，57，11： | 3 |
| 5 | Multi-scale synergic optimization strategy for dielectric energy storage ceramics显示文摘Dielectric capacitors,serving as the indispensable components in advanced high-power energy storage devices,have attracted ever-increasing attention with the rapid development of science and technology.Among various dielectric capacitors,ceramic capacitors with perovskite structures show unique advantages in actual application,e.g.,excellent adaptability in high-temperature environments.And the optimization of their energy storage performance has become a hot research topic recently.This review presents the basic principles of energy storage in dielectric ceramics and introduces multi-scale synergic optimization strategies according to the key factors for superior energy storage performance.By summarizing the common points in numerous works,several universal modification strategies are reviewed,and future research on fatigue fracture of ceramic capacitors under multi-field including but not limited to force,electric,and thermal coupling conditions is also anticipated. | Xuhui Fan Jing Wang Hao Yua Zehan Zheng Ji Zhang Kongjun Zhu | 2023 | Journal of Advanced Ceramics2023，12，4： | 2 |
| 6 | Synthesis of potassium sodium niobate powders using an EDTA/citrate complexing sol-gel method显示文摘Potassium sodium niobate(KNN) powders were synthesized by a modified sol-gel method,using as starting chemicals potassium carbonate,sodium carbonate,and niobium hydroxide,and,as esterification and chelating agents,respectively,ethylene glycol(EG) and ethylene diamine tetraacetic acid(EDTA)/citrate.The effects of citric acid(CA),EG,and EDTA on the stability of the precursor sol were systemically investigated.The powders and gels were characterized by X-ray diffraction,scanning electron microscopy,Fourier transform infrared spectroscopy,and thermogravimetric analysis-differential scanning calorimetry(TGA-DSC).The results indicated that a stable precursor sol was formed when n(CA):n(Mn+)=3:1,n(EDTA):n(NH4OH)=1:3.5,and n(CA):n(EG)=1:2.The xerogel was calcined at 500-950℃ to prepare the KNN powder.Pure KNN perovskite phase with a cube-like structure was synthesized at 850℃ from the precursor sol for a K/Na molar ratio of 1.2.The formation mechanism of the KNN perovskite phase was also discussed. | Yang Cao Kongjun Zhu Hongjuan Zheng Jinhao Qiu Honghui Gu | 2012 | Particuology2012，10，6： | 2 |
| 7 | Effect of washing of barium titanate powders synthesized by hydrothermal method on their sinterability and piezoelectric properties显示文摘 | Kongjun Zhu Jinhao Oiu Koji Kajiyoshi Masayuki Takai Kazumichi Yanagisawa | 2008 | Ceramics International2008，，： | 1 |
| 8 | Phase evolution of(K,Na)NbO_3 powder prepared by high temperature mixing under hydrothermal conditions显示文摘(Na,K)NbO3(KNN)powders were successfully prepared by high temperature mixing method(HTMM) under hydrothermal conditions to study the effect of reaction time on the formation of KNN for three K+/(K++Na+)ratios of 0.6,0.7 and 0.8.The products were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscopy(TEM)and selected area electron diffraction(SAED),to show the change of phase and morphology of the as-prepared particles with the K+/(K++Na+)molar ratio in the solution.Pure Na-rich KNN monoclinic phase and pure K-rich KNN orthorhombic phase could be obtained quickly after mixing the solutions at high temperature when the K+/(K++Na+)molar ratio was either 0.6 or 0.8.When the K+/(K++Na+)molar ratio was 0.7,however,the K-rich KNN orthorhombic phase grain formed first,followed by the Na-rich KNN monoclinic phase grain,with the two phases coexisting in the final product. | Lin Bai Kongjun Zhu Jinhao Qiu Hongli Ji Likui Su | 2010 | Particuology2010，8，5： | 1 |
| 9 | Enhancedelectromagnetic wave absorption properties of polyaniline-coated Fe3OJreduced graphene oxide nanocomposites 显示文摘 | Chen Tian Qiu Jinhao Zhu Kongjun | 2014 | Journal of Materials Science2014，25，9： | 1 |
| 10 | Hydrothermal synthesis of sodium niobate with controllableshape and structure显示文摘 | ZHU Kongjun CAO Yang WANG Xiaohui | 2012 | CrystEngComm2012，2，： | 1 |
| 11 | Preparation and characterization of monodispersed BaTiO 3 nanocrystals by sol–hydrothemal method显示文摘 | Hongjuan Zheng Kongjun Zhu Qingliu Wu Jinsong Liu Jinhao Qiu | 2013 | Journal of Crystal Growth2013，，： | 1 |
| 12 | Hydrothermal synthesis of sodium niobate with controllable shape and structure 显示文摘 | Zhu Kongjun Cao Yang Wang Xiaohui | 2012 | CrystEngComm2012，14，： | 1 |
| 13 | Multi-modal vibration control using a synchronized switchbased on a displacement switching threshold显示文摘 | Hongli Ji Jinhao Qiu Kongjun ZHU | 2009 | Smart Materials and Structures2009，18，3： | 1 |
| 14 | Two- mode vibration control of a beam using nonlinear syn- chronized switching damping based on the maximiza- tion of converted energy 显示文摘 | Ji Hongli Qiu Jinhao Zhu Kongjun | 2010 | Journal of Sound and Vibration2010，329，35： | 1 |
| 15 | Influence of sintering temperature on electrical properties of(K_(0.4425)Na_(0.52)Li_(0.0375))(Nb_(0.8825)Sb_(0.07)Ta_(0.0475))O_(3) ceramics without phase transition induced by sintering temperature显示文摘Lead-free(K_(0.4425)Na_(0.52)Li_(0.0375))(Nb_(0.8825)Sb_(0.07)Ta_(0.0475))O_(3)(KNLNST)piezoelectric ceramics are synthesized by the conventional solid-state reaction method.The sintering temperature and poling temperature dependence of ceramic properties are investigated.Previous studies have shown that variation of sintering temperature can cause phase transition,similar to the morphotropic phase boundary(MPB)behavior induced by composition changes in Pb(Zr,Ti)O_(3)(PZT).And the best piezoelectric performance can be obtained near the phase-transition sintering temperature.In this research,phase transition induced by sintering temperature cannot be detected and excellent piezoelectric properties can still be obtained.The sintering temperature of the largest piezoelectric coefficient of such composition is lower than that of the highest density,which is considered in composition segregation as a result of intensified volatilization of alkali metal oxides.Combined with the effect of poling temperature,the peak values of the piezoelectric properties are d_(33)=313 pC/N,k_(p)=47%,ε_(r)=1825,tanδd=0.024,T_(o-t)=88℃,and TC=274℃. | Shaohua QIAN Kongjun ZHU Xuming PANG Jing WANG Jinsong LIU Jinhao QIU | 2013 | Journal of Advanced Ceramics2013，2，4： | 0 |
| 16 | Microstructure and piezoelectric properties of K_(5.70)Li_(4.07)Nb_(10.23)O_(3)0-added K_(0.5)Na_(0.5)NbO_(3) ceramics显示文摘Lead-free piezoelectric ceramics K_(0.5)Na_(0.5)NbO_(3)-xmol%K_(5.70)Li_(4.07)Nb_(10.23)O_(3)0(x=0-2.5,KNN-xmol%KLN)were prepared by conventional sintering technique.The phase structure and electrical properties of KNN ceramics were investigated as a function of KLN concentration.The results showed that small amount of KLN introduced into the lattice formed a single phase perovskite structure.The KLN modification lowered the phase transition temperature of orthorhombic-tetragonal(T_(O-T))and increased the Curie temperature(T_(C)).Some abnormal coarse grains were formed in a matrix when the content of KLN was relatively low(1 mol%).However,normally grown grains were only observed when the sintering aid content was increased to 2 mol%.Proper content of KLN decreased the amount of defects,thus the remanent polarization increased and the coercive field decreased markedly,and the sinterability of the KNN ceramics was simultaneously improved with significant increase of piezoelectric properties. | Xuming PANG Jinhao QIU Kongjun ZHU | 2014 | Journal of Advanced Ceramics2014，3，2： | 0 |
| 17 | Novel Fe/glass composite adsorbent for As(V) removal显示文摘An effective adsorbent for arsenic removal was synthesized by hydrothermal treatment of waste glass powder (GP), followed by loading Fe(Ⅲ) oxyhydroxide onto the surface of waste glass powder. The ≡Si-O-H group was formed on the surface of GP and the specific surface area of GP powder was slightly increased after hydrothermal treatment. FeOOH was loaded onto the surface of hydrothermally treated waste glass powder (HGP) by the hydrolysis of FeCl3. The formation conditions of FeOOH were also investigated. The ability of this new adsorbent for arsenic (As(Ⅴ)) removal was evaluated. The results indicated that the highest removal efficiency was about 97% for 1 mg/L As(Ⅴ) solution at pH 6 and keeping time 2 h. | WANG Ying ZHU Kongjun WANG Fen YANAGISAWA Kazumichi | 2009 | Journal of Environmental Sciences2009，21，4： | 0 |
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